package com.atguigu.eduservice.service.impl;

import com.atguigu.eduservice.entity.EduChapter;
import com.atguigu.eduservice.entity.EduVideo;
import com.atguigu.eduservice.entity.chapter.ChapterVo;
import com.atguigu.eduservice.entity.chapter.VideoVo;
import com.atguigu.eduservice.mapper.EduChapterMapper;
import com.atguigu.eduservice.service.EduChapterService;
import com.atguigu.eduservice.service.EduVideoService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

/**
 * <p>
 * 课程 服务实现类
 * </p>
 *
 * @author Lei Deng
 * @since 2021-12-24
 */
@Service
public class EduChapterServiceImpl extends ServiceImpl<EduChapterMapper, EduChapter> implements EduChapterService {

    @Autowired
    private EduVideoService videoService;

    @Override
    public List<ChapterVo> getChapterVideoByCourseId(String courseId) {
        QueryWrapper<EduChapter> wrapperChapter = new QueryWrapper<>();
        wrapperChapter.eq("course_id", courseId);
        List<EduChapter> eduChapters = baseMapper.selectList(wrapperChapter);

        QueryWrapper<EduVideo> wrapperVideo = new QueryWrapper<>();
        wrapperVideo.eq("course_id", courseId);
        List<EduVideo> eduVideos = videoService.list(wrapperVideo);

        List<ChapterVo> finalList = new ArrayList<>();
        for (EduChapter eduChapter : eduChapters) {
            ChapterVo chapterVo = new ChapterVo();
            BeanUtils.copyProperties(eduChapter, chapterVo);
            for (EduVideo eduVideo : eduVideos) {
                VideoVo videoVo = new VideoVo();
                BeanUtils.copyProperties(eduVideo, videoVo);
                if (eduVideo.getChapterId().equals(eduChapter.getId())) {
                    chapterVo.getChildren().add(videoVo);
                }
            }
            finalList.add(chapterVo);
        }

        return finalList;
    }

    /**
     * 删除章节
     *
     * @param chapterId
     * @return
     */
    @Override
    public boolean deleteChapter(String chapterId) {
        QueryWrapper<EduVideo> wrapper = new QueryWrapper<>();
        wrapper.eq("chapter_id", chapterId);
        int count = videoService.count(wrapper);
        if (count > 1) {
            throw new GuliException(20001, "请先删除章节下的小节");
        } else {
            int result = baseMapper.deleteById(chapterId);
            return result > 0;
        }
    }

    @Override
    public void removeChapterByCourseId(String courseId) {
        QueryWrapper<EduChapter> wrapper = new QueryWrapper<>();
        wrapper.eq("course_id", courseId);
        baseMapper.delete(wrapper);
    }
}
